-module(multipartkit@infer).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/multipartkit/infer.gleam").
-export([default_inferer/0, content_type_from_filename/1, content_type_from_bytes/1]).
-export_type([inferer/0]).

-if(?OTP_RELEASE >= 27).
-define(MODULEDOC(Str), -moduledoc(Str)).
-define(DOC(Str), -doc(Str)).
-else.
-define(MODULEDOC(Str), -compile([])).
-define(DOC(Str), -compile([])).
-endif.

-type inferer() :: {inferer,
        fun((binary()) -> gleam@option:option(binary())),
        fun((bitstring()) -> gleam@option:option(binary()))}.

-file("src/multipartkit/infer.gleam", 58).
-spec noop_filename(binary()) -> gleam@option:option(binary()).
noop_filename(_) ->
    none.

-file("src/multipartkit/infer.gleam", 62).
-spec noop_bytes(bitstring()) -> gleam@option:option(binary()).
noop_bytes(_) ->
    none.

-file("src/multipartkit/infer.gleam", 54).
?DOC(
    " Inferer that always returns `None`.\n"
    "\n"
    " `add_file_auto` uses this and therefore always emits\n"
    " `application/octet-stream` unless the host swaps in a real inferer via\n"
    " `add_file_auto_with`.\n"
).
-spec default_inferer() -> inferer().
default_inferer() ->
    {inferer, fun noop_filename/1, fun noop_bytes/1}.

-file("src/multipartkit/infer.gleam", 71).
?DOC(
    " Optional content-type inference from a filename.\n"
    "\n"
    " The default v0.1.0 implementation always returns `None`. Wire `mimetype`\n"
    " (or another inferer) in via `form.add_file_auto_with` to enable\n"
    " inference.\n"
).
-spec content_type_from_filename(binary()) -> gleam@option:option(binary()).
content_type_from_filename(Filename) ->
    (erlang:element(2, default_inferer()))(Filename).

-file("src/multipartkit/infer.gleam", 78).
?DOC(
    " Optional content-type inference from a body byte sequence.\n"
    "\n"
    " Same default-`None` policy as `content_type_from_filename`.\n"
).
-spec content_type_from_bytes(bitstring()) -> gleam@option:option(binary()).
content_type_from_bytes(Body) ->
    (erlang:element(3, default_inferer()))(Body).